Cleaning sponge



FIG. 1 is a perspective view of the new design for a cleaning sponge;

FIG. 2 is a top view thereof, the bottom view being a mirror image thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a right side view thereof; and,

FIG. 5 is a rear view thereof, the front view being a mirror image thereof. 

The ornamental design for a cleaning sponge, as shown and described. 